Develop Reference

'android.os.AsyncTask' is deprecated in a register Activity, Android Studio

I´m did a register activity, in this activity I've two spinner one to state and other to city,the activity send the string of the spinner of state to phpfile and this return all the cities of this state and in the java fill the spinner with this cities, I use AsyncTask with a class to do the query to my php file in http server and I get this error in all the class 'android.os.AsyncTask' is deprecated.
Someone can help me or orientedme to fix that.
private class GetModelFromServer extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(registro.this);
pDialog.setMessage("Fetching Data");
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
estado = spinnerEstado.getSelectedItem().toString();
Handler jsonParser = new Handler();
String json = null;
try {
json = jsonParser.makeServiceCall("https://chilaquilesenterprise.com/localidades/get_model.php?nombre_estado="+ URLEncoder.encode(estado,"UTF-8"), Handler.GET);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
Log.e("Response: ", "> " + json);
if (json != null) {
try {
JSONObject jsonObj = new JSONObject(json);
if (jsonObj != null) {
JSONArray model = jsonObj
.getJSONArray("nombre");
for (int i = 0; i < model.length(); i++) {
JSONObject modObj = (JSONObject) model.get(i);
Nombre nom = new Nombre(modObj.getString("nombre"));
nombreList.add(nom);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}else {
Log.e("JSON Data", "Didn't receive any data from server!");
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
populateSpinnerModel();
}
}

onPostExecute AsyncTask not executed right after task.execute()

I have an issue with AsyncTask
String latlong = "lat=48.8534100&lon=2.3488000";
city = "Paris";
getWeather w = new getWeather(latlong,this);
w.execute();
This gs.alerter() should be executed after the onpostexecute, but it's execued before
gs.alerter("thiss" + currentWeather); //This is a Log.i function
gs.cities.add(new City(city, currentWeather + "°", image));
initializeAdapter();
The AsyncTask class is :
public class getWeather extends AsyncTask<Void, Void, JSONObject> {
String latlong;
MainActivity obj;
JSONParser jParser = new JSONParser();
JSONObject json;
public getWeather(String latlong,MainActivity obj)
{
this.latlong = latlong;
this.obj = obj;
}
#Override
protected JSONObject doInBackground(Void... params) {
// TODO Auto-generated method stub
String URL = "http://api.openweathermap.org/data/2.5/weather?" +
latlong +
"&appid=APIKEY" +
"&units=metric";
json = jParser.getJSONFromUrl(URL);
return json;
}
#Override
protected void onPostExecute(JSONObject result) {
this.obj.setWeather(result);
}
#Override
protected void onPreExecute() {
super.onPreExecute();
}
}
The setweather code is on the activity class :
public void setWeather(JSONObject obj){
try {
JSONObject main = obj.getJSONObject("main");
Double initWeather = new Double(main.getString("temp"));
int finalWeather = (int)Math.round(initWeather * 1) / 1;
this.currentWeather = Integer.toString(finalWeather);
This gs.alerter() should be executed just right after the .execute()
gs.alerter(this.currentWeather);
} catch (JSONException e) {
e.printStackTrace();
}
}
So the problem is that the code just after .execute() is executed after onpostexecute(). I want to execute it in this order :
.execute()
onpostexecute() to affect the currentWeather variable
And then add City ...
Any help is needed.
Thank you all
PS : I am a beginner in Android development :)

put this code into a method:
public void methodName() {
gs.alerter("thiss" + currentWeather); //This is a Log.i function
gs.cities.add(new City(city, currentWeather + "°", image));
initializeAdapter();
}
and now:
#Override
protected void onPostExecute(JSONObject result) {
this.obj.setWeather(result);
obj.methodName();
}

Create Interface
public interface OnTaskCompleted{
void onTaskCompleted();
}
Your Activity Code will look like
class YourActivity implements OnTaskCompleted {
void someFunctionToExecute()
{
String latlong = "lat=48.8534100&lon=2.3488000";
city = "Paris";
getWeather w = new getWeather(latlong,this);
w.execute();
}
// this code will be called after postExecute
void OnTaskCompleted(){
gs.alerter("thiss" + currentWeather);
gs.cities.add(new City(city, currentWeather + "°", image));
initializeAdapter();
}
}
Your AsyncTask Code Will look like
public class getWeather extends AsyncTask<Void, Void, JSONObject> {
String latlong;
MainActivity obj;
JSONParser jParser = new JSONParser();
JSONObject json;
public getWeather(String latlong,MainActivity obj)
{
this.latlong = latlong;
this.obj = obj;
}
#Override
protected JSONObject doInBackground(Void... params) {
// TODO Auto-generated method stub
String URL = "http://api.openweathermap.org/data/2.5/weather?" +
latlong +
"&appid=APIKEY" +
"&units=metric";
json = jParser.getJSONFromUrl(URL);
return json;
}
#Override
protected void onPostExecute(JSONObject result) {
this.obj.setWeather(result);
}
#Override
protected void onPreExecute() {
super.onPreExecute();
obj.OnTaskCompleted(); // calling after postexecute
}
}

Exact procedure to add an image through json android

Hello so I have already an expirience with AsyncTask so I can manage to get some data with PHP scripts from an SQL Server and parsed them with JSON. Now what I would want is to know how can I use the AsyncTask in order to load images to some activities. Also is there anyway that I can call the AsyncTask before the app starts? because that would be really helpful too.
I don't have any adapters I am just using this for the AsyncTask:
// The definition of our task class
private class PostTask extends AsyncTask<String, Integer, String> {
private String postName;
private JSONObject jsonvar = new JSONObject();
#Override
protected void onPreExecute() {
super.onPreExecute();
}
#Override
protected String doInBackground(String... params) {
this.postName = params[0];
String status = "";
List<NameValuePair> values = new ArrayList<NameValuePair>();
values.add( new BasicNameValuePair( "username", this.postName ) );
final AndroidHttpClient client = AndroidHttpClient.newInstance( "" );
HttpResponse response = HttpHelper.postResponse( client, Register.phpUrl, values );
String data = HttpHelper.getData( response );
try {
jsonvar = new JSONObject(data);
status=jsonvar.getString("status");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
client.close();
return status;
}
// #Override
// protected void onProgressUpdate(Integer... values) {
// super.onProgressUpdate(values);
// }
#Override
protected void onPostExecute(String status) {
String session = "", status_message = " ";
try {
status_message = jsonvar.getString("status_message");
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
super.onPostExecute(status);
}
}
}

As i can tell with information provided, supposing that what you read from your server is the image URL and obtain it in JSON format, what i would do is writing a listener to your AsyncTask, calling it in onPostExecute method, and loading it in your Activity using PicassoImagesLoader
Something like:
private class PostTask extends AsyncTask<String, Integer, String> {
public interface onLoadFinishedListener {
public void onLoadFinished(JSONObject response)
}
protected JSONObject onPostExecute(JSONObject response){
onLoadFinished(response);
}
}
And in your Activity:
public myActivity extends Activity implements PostTask.onLoadFinishedListener {
#Override
onLoadFinished(JSONObject response){
Picasso.with(this).load(response.getString("url")).into(imageView);
}
}
Something like this would help :)

Passing object model to another AsyncTask from other AsyncTask and adding data to model doesn't render

This is my first async task, which gets called first, it gets data from server and then onPostExecute it executes other async task, which downloads and sets image.
private class GetData extends AsyncTask<String, Void, Void> {
private final HttpClient client = new DefaultHttpClient();
private String content;
private String error = null;
#Override
protected void onPreExecute() {
}
#Override
protected void onProgressUpdate(Void... progress) {
}
#Override
protected Void doInBackground(String... params) {
try {
HttpGet httpget = new HttpGet(params[0]);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
content = client.execute(httpget, responseHandler);
} catch (ClientProtocolException e) {
error = e.getMessage();
cancel(true);
} catch (IOException e) {
error = e.getMessage();
cancel(true);
}
return null;
}
#Override
protected void onPostExecute(Void result) {
if (error == null) {
try {
JSONObject dataDishes = new JSONObject(content);
Log.d("DISHES", dataDishes.toString());
ArrayList<DishModel> dishData = new ArrayList<DishModel>();
for (int i = 0; i < 8; i++) {
DishModel model = new DishModel();
model.setName("Company " + i);
model.setDesc("desc" + i);
//TODO: set data img
new GetImage(model).execute("http://example.com/" + (i + 1) + ".png");
dishData.add(model);
}
ListView listAllDishes = (ListView) getView().findViewById(R.id.listView);
DishRowAdapter adapterAllDishes = new DishRowAdapter(getActivity(),
R.layout.dish_row, dishData);
listAllDishes.setAdapter(adapterAllDishes);
} catch (JSONException e) {
Log.d("DISHES", e.toString());
}
} else {
Log.e("DISHES", error);
}
}
}
This is another async task, it downloads image and onPostExecute it sets image to passed model.
private class GetImage extends AsyncTask<String, Void, Void> {
private DishModel model;
private Bitmap bmp;
public getImage(DishModel model) {
this.model = model;
}
#Override
protected void onPreExecute() {
}
#Override
protected void onProgressUpdate(Void... progress) {
}
#Override
protected Void doInBackground(String... params) {
try {
URL url = new URL(params[0]);
Log.d("DISHES", params[0]);
try {
bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
} catch (IOException e) {
Log.d("DISHES", e.toString());
}
} catch (MalformedURLException e) {
Log.d("DISHES", e.toString());
}
return null;
}
#Override
protected void onPostExecute(Void result) {
model.setPhoto(bmp);
}
}
It works if I do both data/image download proccess in one AsyncTask doInBackground(String... params), but it doesnt when I split data and image downloading into seperate async tasks. Furthermore I dont get any exceptions or errors.
UPDATE: Images shows up when i switch views..

At first, getImage and getData are classes, and classes names in Java are capitalized.
Technically, you can run another AsyncTask from onProgressUpdate() or onPostExecute() - https://stackoverflow.com/a/5780190/1159507
So, try to put the breakpoint in second AsyncTask call and debug is it called.

The method findViewById(int) is undefined

I'm new to Android development and I'm trying to code a little app which allows me to grab an external JSON file and parse it. I got this to work, however it wont work if I try to execute it in the background as an AsyncTask. Eclipse gives me the error
The method findViewById(int) is undefined for the type LongOperation
in this line:
TextView txtView1 = (TextView)findViewById(R.id.TextView01);
Here is my code:
public class Main extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new LongOperation().execute();
}
}
class LongOperation extends AsyncTask<String, Void, String> {
private final Context LongOperation = null;
#Override
protected String doInBackground(String... params) {
try {
URL json = new URL("http://www.corps-marchia.de/jsontest.php");
URLConnection tc = json.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(tc.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
JSONArray ja = new JSONArray(line);
JSONObject jo = (JSONObject) ja.get(0);
TextView txtView1 = (TextView)findViewById(R.id.TextView01);
txtView1.setText(jo.getString("text") + " - " + jo.getString("secondtest"));
}
} catch (MalformedURLException e) {
Toast.makeText(this.LongOperation, "Malformed URL Exception: " + e, Toast.LENGTH_LONG).show();
} catch (IOException e) {
Toast.makeText(this.LongOperation, "IO Exception: " + e, Toast.LENGTH_LONG).show();
} catch (JSONException e) {
Toast.makeText(this.LongOperation, "JSON Exception: " + e, Toast.LENGTH_LONG).show();
}
return null;
}
#Override
protected void onPostExecute(String result) {
}
protected void onPreExecute() {
}
#Override
protected void onProgressUpdate(Void... values) {
ProgressDialog pd = new ProgressDialog(LongOperation);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("Working...");
pd.setIndeterminate(true);
pd.setCancelable(false);
}
}
Any ideas on how to fix this?

Here is what you should do to make it work as you want. Use onPostExecude()
public class Main extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new LongOperation(this).execute();
}
}
class LongOperation extends AsyncTask<String, Void, String> {
private Main longOperationContext = null;
public LongOperation(Main context) {
longOperationContext = context;
Log.v("LongOper", "Konstuktor");
}
#Override
protected String doInBackground(String... params) {
Log.v("doInBackground", "inside");
StringBuilder sb = new StringBuilder();
try {
URL json = new URL("http://www.corps-marchia.de/jsontest.php");
URLConnection tc = json.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(tc.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
JSONArray ja = new JSONArray(line);
JSONObject jo = (JSONObject) ja.get(0);
Log.v("line = ", "jo.getString() ="+jo.getString("text"));
sb.append(jo.getString("text") + " - " + jo.getString("secondtest")).append("\n");
}
} catch (MalformedURLException e) {
e.printStackTrace();
Log.v("Error", "URL exc");
} catch (IOException e) {
e.printStackTrace();
Log.v("ERROR", "IOEXECPTOIn");
} catch (JSONException e) {
e.printStackTrace();
Log.v("Error", "JsonException");
}
String result = sb.toString();
return result;
}
#Override
protected void onPostExecute(String result) {
Log.v("onPostExe", "result = "+result);
TextView txtView1 = (TextView)longOperationContext.findViewById(R.id.textView01);
txtView1.setText(result);
}
protected void onPreExecute() {
}
#Override
protected void onProgressUpdate(Void... values) {
ProgressDialog pd = new ProgressDialog(longOperationContext);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("Working...");
pd.setIndeterminate(true);
pd.setCancelable(false);
}
}

The implementation of AsyncTask in one of the other answers is flawed. The progress dialog is being created every time within publishProgress, and the reference to the dialog is not visible outside the method. Here is my attempt:
public class Main extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new LongOperation().execute();
}
class LongOperation extends AsyncTask<String, Void, String> {
ProgressDialog pd = null;
TextView tv = null;
#Override
protected void onPreExecute(){
tv = Main.this.findViewById(R.id.textvewid);
pd = new ProgressDialog(Main.this);
pd.setMessage("Working...");
// setup rest of progress dialog
}
#Override
protected String doInBackground(String... params) {
//perform existing background task
return result;
}
#Override
protected void onPostExecute(String result){
pd.dismiss();
tv.setText(result);
}
}
}

You are trying to do something which won't work. First of all you are inside of a class that extends AsyncTask so you won't have that method available as it is a method of the class Activity.
The second problem is that you are trying to do UI stuff in a method that is not synchronized with the UI thread. That is nothing you would want to do.
Process your JSON response in the doInBackground method and pass the result to the onPostExecute method where you will be able to handle UI stuff as it is synchronized with the UI thread.
The current setup you have will not make it easier for you to handle what you are trying to do anyway. You could make your LongOperation class a private class of your Activity class and define the TextView as a instance member. Grab it off the layout using findViewById inside of your OnCreate and modify (set text or whatever) inside the onPostExecute method of your AsyncTask.
I hope it is somewhat clear what I meant.

findViewById is method in Activity class. You should pass instance of your activity to your LongOperation when you create it. Then use that instance to call findViewById.